Let me try again, as you seem to miss the point:
If I am in the guard and go for the omoplata and sweep the guy --> POINTS (as I initiated the sweep from my guard and NO the omoplata itself is not a guard)
If I go for the omoplata from mount, roll under and roll him again --> NO points.
Here is a scenario: I have mount, go for the armbar, he stacks me (gets on top) and I manage to push him back down (while hanging on to the armbar), then establish side control --> No points, because all this was taking place, while he was defending a sub.
Same with an omoplata attempt from mount.
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There was actually a debate (not sure if the IBJJF cleared that up yet) that you DON'T get sweep points for omoplata from guard even, depending on if
a) I sweep him actively or
b) he rolls himself to escape the pressure --> no points